Bug#679853: general: Too much downtime during a big dist-upgrade - avoidable with snapshots
2012/7/2 Philipp Kern <email@example.com>:
> it is not sufficient on a Debian system to just branch off the root filesystem
> given that important state information of the package manager is stored in
Yes, this seems to be a valid objection.
However [call me a heretic if you want] does this state information
really belong to /var? It is written to only when /usr is written to,
by the same package manager that modifies the root fs and /usr. Maybe
it's time to move it to /usr so that it is not intermixed with really
variable user data.
Alexander E. Patrakov